[#3623] Enhance neighborhood template features for BerliOS.
Now you can add users to a pre-existing group when the
project is created. Previously, you could create a new
group and add users to that, but you couldn't add users
to a group that already existed.
Now you can use string templates in tool config option
values. All attrs from project.dict['root_project']
are available. So, for example, when configuring a link
tool, you can do something like this: